//
// SPDX-License-Identifier: BSD-3-Clause
// Copyright (c) Contributors to the OpenEXR Project.
//

#ifdef NDEBUG
#    undef NDEBUG
#endif

#include <iostream>
#include <string>
#include <vector>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>

#include "tmpDir.h"
#include "testCopyMultiPartFile.h"
#include "random.h"

#include <IlmThreadPool.h>
#include <ImfMultiPartInputFile.h>
#include <ImfMultiPartOutputFile.h>
#include <ImfArray.h>
#include <ImfChannelList.h>
#include <ImfDeepFrameBuffer.h>
#include <ImfFrameBuffer.h>
#include <ImfOutputPart.h>
#include <ImfInputPart.h>
#include <ImfTiledOutputPart.h>
#include <ImfTiledInputPart.h>
#include <ImfDeepTiledOutputPart.h>
#include <ImfDeepScanLineOutputPart.h>
#include <ImfDeepTiledInputPart.h>
#include <ImfDeepScanLineInputPart.h>
#include <ImfPartType.h>
#include <ImfNamespace.h>


namespace IMF = OPENEXR_IMF_NAMESPACE;
using namespace IMF;
using namespace std;
using namespace IMATH_NAMESPACE;
using namespace ILMTHREAD_NAMESPACE;

namespace
{

const int height = 247;
const int width = 233;

vector<Header> headers;
vector<int> pixelTypes;
vector<int> partTypes;
vector<int> levelModes;

template <class T>
void fillPixels (Array2D<T> &ph, int width, int height)
{
    ph.resizeErase(height, width);
    for (int y = 0; y < height; ++y)
        for (int x = 0; x < width; ++x)
        {
            //
            // We do this because half cannot store number bigger than 2048 exactly.
            //
            ph[y][x] = (y * width + x) % 2049;
        }
}

template <class T>
void fillPixels (Array2D<unsigned int>& sampleCount, Array2D<T*> &ph, int width, int height)
{
    ph.resizeErase(height, width);
    for (int y = 0; y < height; ++y)
        for (int x = 0; x < width; ++x)
        {
            ph[y][x] = new T[sampleCount[y][x]];
            for (unsigned int i = 0; i < sampleCount[y][x]; i++)
            {
                //
                // We do this because half cannot store number bigger than 2048 exactly.
                //
                ph[y][x][i] = (y * width + x) % 2049;
            }
        }
}

void allocatePixels(int type, Array2D<unsigned int>& sampleCount,
                    Array2D<unsigned int*>& uintData, Array2D<float*>& floatData,
                    Array2D<half*>& halfData, int x1, int x2, int y1, int y2)
{
    for (int y = y1; y <= y2; y++)
        for (int x = x1; x <= x2; x++)
        {
            if (type == 0)
                uintData[y][x] = new unsigned int[sampleCount[y][x]];
            if (type == 1)
                floatData[y][x] = new float[sampleCount[y][x]];
            if (type == 2)
                halfData[y][x] = new half[sampleCount[y][x]];
        }
}

void allocatePixels(int type, Array2D<unsigned int>& sampleCount,
                    Array2D<unsigned int*>& uintData, Array2D<float*>& floatData,
                    Array2D<half*>& halfData, int width, int height)
{
    allocatePixels(type, sampleCount, uintData, floatData, halfData, 0, width - 1, 0, height - 1);
}

void releasePixels(int type, Array2D<unsigned int*>& uintData, Array2D<float*>& floatData,
                   Array2D<half*>& halfData, int x1, int x2, int y1, int y2)
{
    for (int y = y1; y <= y2; y++)
        for (int x = x1; x <= x2; x++)
        {
            if (type == 0)
                delete[] uintData[y][x];
            if (type == 1)
                delete[] floatData[y][x];
            if (type == 2)
                delete[] halfData[y][x];
        }
}

void releasePixels(int type, Array2D<unsigned int*>& uintData, Array2D<float*>& floatData,
                   Array2D<half*>& halfData, int width, int height)
{
    releasePixels(type, uintData, floatData, halfData, 0, width - 1, 0, height - 1);
}

template <class T>
bool checkPixels (Array2D<T> &ph, int lx, int rx, int ly, int ry, int width)
{
    for (int y = ly; y <= ry; ++y)
        for (int x = lx; x <= rx; ++x)
            if (ph[y][x] != static_cast<T>(((y * width + x) % 2049)))
            {
                cout << "value at " << x << ", " << y << ": " << ph[y][x]
                     << ", should be " << (y * width + x) % 2049 << endl << flush;
                return false;
            }
    return true;
}

template <class T>
bool checkPixels (Array2D<T> &ph, int width, int height)
{
    return checkPixels<T> (ph, 0, width - 1, 0, height - 1, width);
}

template <class T>
bool checkPixels (Array2D<unsigned int>& sampleCount, Array2D<T*> &ph,
                  int lx, int rx, int ly, int ry, int width)
{
    for (int y = ly; y <= ry; ++y)
        for (int x = lx; x <= rx; ++x)
        {
            for (unsigned int i = 0; i < sampleCount[y][x]; i++)
            {
                if (ph[y][x][i] != static_cast<T>(((y * width + x) % 2049)))
                {
                    cout << "value at " << x << ", " << y << ", sample " << i << ": " << ph[y][x][i]
                         << ", should be " << (y * width + x) % 2049 << endl << flush;
                    return false;
                }
            }
        }
    return true;
}

template <class T>
bool checkPixels (Array2D<unsigned int>& sampleCount, Array2D<T*> &ph, int width, int height)
{
    return checkPixels<T> (sampleCount, ph, 0, width - 1, 0, height - 1, width);
}

#if 0
bool checkSampleCount(Array2D<unsigned int>& sampleCount, int x1, int x2, int y1, int y2, int width)
{
    for (int i = y1; i <= y2; i++)
        for (int j = x1; j <= x2; j++)
        {
            if (sampleCount[i][j] != ((i * width) + j) % 10 + 1)
            {
                cout << "sample count at " << j << ", " << i << ": " << sampleCount[i][j]
                     << ", should be " << (i * width + j) % 10 + 1 << endl << flush;
                return false;
            }
        }
    return true;
}


bool checkSampleCount(Array2D<unsigned int>& sampleCount, int width, int height)
{
    return checkSampleCount(sampleCount, 0, width - 1, 0, height - 1, width);
}
#endif

void generateRandomHeaders(int partCount, vector<Header>& headers)
{
    cout << "Generating headers and data" << endl << flush;

    headers.clear();
    for (int i = 0; i < partCount; i++)
    {
        Header header (width, 
                       height,
                       1.f, 
                       IMATH_NAMESPACE::V2f (0, 0), 
                       1.f, 
                       INCREASING_Y, 
                       ZIPS_COMPRESSION);
                   
        int pixelType = random_int(3);
        int partType = random_int(4);
        
        pixelTypes[i] = pixelType;
        partTypes[i] = partType;

        stringstream ss;
        ss << i;
        header.setName(ss.str());

        switch (pixelType)
        {
            case 0:
                header.channels().insert("UINT", Channel(IMF::UINT));
                break;
            case 1:
                header.channels().insert("FLOAT", Channel(IMF::FLOAT));
                break;
            case 2:
                header.channels().insert("HALF", Channel(IMF::HALF));
                break;
        }

        switch (partType)
        {
            case 0:
                header.setType(SCANLINEIMAGE);
                break;
            case 1:
                header.setType(TILEDIMAGE);
                break;
            case 2:
                header.setType(DEEPSCANLINE);
                break;
            case 3:
                header.setType(DEEPTILE);
                break;
        }

        int tileX;
        int tileY;
        int levelMode;
        if (partType == 1 || partType == 3)
        {
            tileX = random_int(width) + 1;
            tileY = random_int(height) + 1;
            levelMode = random_int(3);
            levelModes[i] = levelMode;
            LevelMode lm  = NUM_LEVELMODES;
            switch (levelMode)
            {
                case 0:
                    lm = ONE_LEVEL;
                    break;
                case 1:
                    lm = MIPMAP_LEVELS;
                    break;
                case 2:
                    lm = RIPMAP_LEVELS;
                    break;
            }
            header.setTileDescription(TileDescription(tileX, tileY, lm));
        }

 
        int order = random_int(NUM_LINEORDERS);
        if(partType==0 || partType ==2)
        {
            // can't write random scanlines
            order = random_int(NUM_LINEORDERS-1);
        }
        LineOrder l = NUM_LINEORDERS;
        switch(order)
        {
             case 0 : 
                 l = INCREASING_Y;
                 break;
             case 1 :
                  l = DECREASING_Y;
                 break;
             case 2 : 
                  l = RANDOM_Y;
                  break;
        }
        
        header.lineOrder()=l;
        

        if (partType == 0 || partType == 2)
        {
            cout << "pixelType = " << pixelType << " partType = " << partType
                 << " line order =" << header.lineOrder() << endl << flush;
        }
        else
        {
            cout << "pixelType = " << pixelType << " partType = " << partType
                 << " tile order =" << header.lineOrder()
                 << " levelMode = " << levelModes[i] << endl << flush;
        }

        headers.push_back(header);
    }
}

void setOutputFrameBuffer(FrameBuffer& frameBuffer, int pixelType,
                          Array2D<unsigned int>& uData, Array2D<float>& fData,
                          Array2D<half>& hData, int width)
{
    switch (pixelType)
    {
        case 0:
            frameBuffer.insert ("UINT",
                                Slice (IMF::UINT,
                                (char *) (&uData[0][0]),
                                sizeof (uData[0][0]) * 1,
                                sizeof (uData[0][0]) * width));
            break;
        case 1:
            frameBuffer.insert ("FLOAT",
                                Slice (IMF::FLOAT,
                                (char *) (&fData[0][0]),
                                sizeof (fData[0][0]) * 1,
                                sizeof (fData[0][0]) * width));
            break;
        case 2:
            frameBuffer.insert ("HALF",
                                Slice (IMF::HALF,
                                (char *) (&hData[0][0]),
                                sizeof (hData[0][0]) * 1,
                                sizeof (hData[0][0]) * width));
            break;
    }
}

void setOutputDeepFrameBuffer(DeepFrameBuffer& frameBuffer, int pixelType,
                          Array2D<unsigned int*>& uData, Array2D<float*>& fData,
                          Array2D<half*>& hData, int width)
{
    switch (pixelType)
    {
        case 0:
            frameBuffer.insert ("UINT",
                                DeepSlice (IMF::UINT,
                                (char *) (&uData[0][0]),
                                sizeof (uData[0][0]) * 1,
                                sizeof (uData[0][0]) * width,
                                sizeof (unsigned int)));
            break;
        case 1:
            frameBuffer.insert ("FLOAT",
                                DeepSlice (IMF::FLOAT,
                                (char *) (&fData[0][0]),
                                sizeof (fData[0][0]) * 1,
                                sizeof (fData[0][0]) * width,
                                sizeof (float)));
            break;
        case 2:
            frameBuffer.insert ("HALF",
                                DeepSlice (IMF::HALF,
                                (char *) (&hData[0][0]),
                                sizeof (hData[0][0]) * 1,
                                sizeof (hData[0][0]) * width,
                                sizeof (half)));
            break;
    }
}

void setInputFrameBuffer(FrameBuffer& frameBuffer, int pixelType,
                         Array2D<unsigned int>& uData, Array2D<float>& fData,
                         Array2D<half>& hData, int width, int height)
{
    switch (pixelType)
    {
        case 0:
            uData.resizeErase(height, width);
            frameBuffer.insert ("UINT",
                                Slice (IMF::UINT,
                                (char *) (&uData[0][0]),
                                sizeof (uData[0][0]) * 1,
                                sizeof (uData[0][0]) * width,
                                1, 1,
                                0));
            break;
        case 1:
            fData.resizeErase(height, width);
            frameBuffer.insert ("FLOAT",
                                Slice (IMF::FLOAT,
                                (char *) (&fData[0][0]),
                                sizeof (fData[0][0]) * 1,
                                sizeof (fData[0][0]) * width,
                                1, 1,
                                0));
            break;
        case 2:
            hData.resizeErase(height, width);
            frameBuffer.insert ("HALF",
                                Slice (IMF::HALF,
                                (char *) (&hData[0][0]),
                                sizeof (hData[0][0]) * 1,
                                sizeof (hData[0][0]) * width,
                                1, 1,
                                0));
            break;
    }
}

void setInputDeepFrameBuffer(DeepFrameBuffer& frameBuffer, int pixelType,
                             Array2D<unsigned int*>& uData, Array2D<float*>& fData,
                             Array2D<half*>& hData, int width, int height)
{
    switch (pixelType)
    {
        case 0:
            uData.resizeErase(height, width);
            frameBuffer.insert ("UINT",
                                DeepSlice (IMF::UINT,
                                (char *) (&uData[0][0]),
                                sizeof (uData[0][0]) * 1,
                                sizeof (uData[0][0]) * width,
                                sizeof (unsigned int)));
            break;
        case 1:
            fData.resizeErase(height, width);
            frameBuffer.insert ("FLOAT",
                                DeepSlice (IMF::FLOAT,
                                (char *) (&fData[0][0]),
                                sizeof (fData[0][0]) * 1,
                                sizeof (fData[0][0]) * width,
                                sizeof (float)));
            break;
        case 2:
            hData.resizeErase(height, width);
            frameBuffer.insert ("HALF",
                                DeepSlice (IMF::HALF,
                                (char *) (&hData[0][0]),
                                sizeof (hData[0][0]) * 1,
                                sizeof (hData[0][0]) * width,
                                sizeof (half)));
            break;
    }
}

void
generateRandomFile (int partCount, const std::string & srcFn)
{
    //
    // Init data.
    //
    Array2D<half> halfData;
    Array2D<float> floatData;
    Array2D<unsigned int> uintData;

    Array2D<unsigned int> sampleCount;
    Array2D<half*> deepHalfData;
    Array2D<float*> deepFloatData;
    Array2D<unsigned int*> deepUintData;

    vector<GenericOutputFile*> outputfiles;

    pixelTypes.resize(partCount);
    partTypes.resize(partCount);
    levelModes.resize(partCount);

    //
    // Generate headers and data.
    //
    generateRandomHeaders(partCount, headers);

    remove(srcFn.c_str());
    MultiPartOutputFile file(srcFn.c_str(), &headers[0],headers.size());

    //
    // Writing files.
    //
    cout << "Writing files " << flush;

    //
    // Pre-generating frameBuffers.
    //
    for (int i = 0; i < partCount; i++)
    {
        switch (partTypes[i])
        {
            case 0:
            {
                OutputPart part(file, i);

                FrameBuffer frameBuffer;

                fillPixels <unsigned int> (uintData, width, height);
                fillPixels <float> (floatData, width, height);
                fillPixels <half> (halfData, width, height);

                setOutputFrameBuffer(frameBuffer, pixelTypes[i], uintData, floatData, halfData, width);

                part.setFrameBuffer(frameBuffer);

                part.writePixels(height);

                break;
            }
            case 1:
            {
                TiledOutputPart part(file, i);

                int numXLevels = part.numXLevels();
                int numYLevels = part.numYLevels();

                for (int xLevel = 0; xLevel < numXLevels; xLevel++)
                    for (int yLevel = 0; yLevel < numYLevels; yLevel++)
                    {
                        if (!part.isValidLevel(xLevel, yLevel))
                            continue;

                        int w = part.levelWidth(xLevel);
                        int h = part.levelHeight(yLevel);

                        FrameBuffer frameBuffer;

                        fillPixels <unsigned int> (uintData, w, h);
                        fillPixels <float> (floatData, w, h);
                        fillPixels <half> (halfData, w, h);
                        setOutputFrameBuffer(frameBuffer, pixelTypes[i],
                                             uintData, floatData, halfData,
                                             w);

                        part.setFrameBuffer(frameBuffer);

                        part.writeTiles(0, part.numXTiles(xLevel) - 1,
                                        0, part.numYTiles(yLevel) - 1,
                                        xLevel, yLevel);
                    }

                break;
            }
            case 2:
            {
                DeepScanLineOutputPart part(file, i);

                DeepFrameBuffer frameBuffer;

                sampleCount.resizeErase(height, width);
                for (int j = 0; j < height; j++)
                    for (int k = 0; k < width; k++)
                        sampleCount[j][k] = (j * width + k) % 10 + 1;

                frameBuffer.insertSampleCountSlice (Slice (IMF::UINT,
                                                    (char *) (&sampleCount[0][0]),
                                                    sizeof (unsigned int) * 1,
                                                    sizeof (unsigned int) * width));

                if (pixelTypes[i] == 0)
                    fillPixels <unsigned int> (sampleCount, deepUintData, width, height);
                if (pixelTypes[i] == 1)
                    fillPixels <float> (sampleCount, deepFloatData, width, height);
                if (pixelTypes[i] == 2)
                    fillPixels <half> (sampleCount, deepHalfData, width, height);
                setOutputDeepFrameBuffer(frameBuffer, pixelTypes[i],
                                         deepUintData, deepFloatData, deepHalfData,
                                         width);

                part.setFrameBuffer(frameBuffer);

                part.writePixels(height);

                releasePixels(pixelTypes[i], deepUintData, deepFloatData, deepHalfData, width, height);

                break;
            }
            case 3:
            {
                DeepTiledOutputPart part(file, i);

                int numXLevels = part.numXLevels();
                int numYLevels = part.numYLevels();

                for (int xLevel = 0; xLevel < numXLevels; xLevel++)
                    for (int yLevel = 0; yLevel < numYLevels; yLevel++)
                    {
                        if (!part.isValidLevel(xLevel, yLevel))
                            continue;

                        int w = part.levelWidth(xLevel);
                        int h = part.levelHeight(yLevel);

                        DeepFrameBuffer frameBuffer;

                        sampleCount.resizeErase(h, w);
                        for (int j = 0; j < h; j++)
                            for (int k = 0; k < w; k++)
                                sampleCount[j][k] = (j * w + k) % 10 + 1;

                        frameBuffer.insertSampleCountSlice (Slice (IMF::UINT,
                                                            (char *) (&sampleCount[0][0]),
                                                            sizeof (unsigned int) * 1,
                                                            sizeof (unsigned int) * w));

                        if (pixelTypes[i] == 0)
                            fillPixels <unsigned int> (sampleCount, deepUintData, w, h);
                        if (pixelTypes[i] == 1)
                            fillPixels <float> (sampleCount, deepFloatData, w, h);
                        if (pixelTypes[i] == 2)
                            fillPixels <half> (sampleCount, deepHalfData, w, h);
                        setOutputDeepFrameBuffer(frameBuffer, pixelTypes[i],
                                                 deepUintData, deepFloatData, deepHalfData,
                                                 w);

                        part.setFrameBuffer(frameBuffer);

                        part.writeTiles(0, part.numXTiles(xLevel) - 1,
                                        0, part.numYTiles(yLevel) - 1,
                                        xLevel, yLevel);

                        releasePixels(pixelTypes[i], deepUintData, deepFloatData, deepHalfData, w, h);
                    }

                break;
            }
        }
    }
}

void
readWholeFiles (const std::string & cpyFn)
{
    Array2D<unsigned int> uData;
    Array2D<float> fData;
    Array2D<half> hData;

    Array2D<unsigned int*> deepUData;
    Array2D<float*> deepFData;
    Array2D<half*> deepHData;

    Array2D<unsigned int> sampleCount;

    MultiPartInputFile file(cpyFn.c_str());
    for (int i = 0; i < file.parts(); i++)
    {
        const Header& header = file.header(i);
        assert (header.displayWindow() == headers[i].displayWindow());
        assert (header.dataWindow() == headers[i].dataWindow());
        assert (header.pixelAspectRatio() == headers[i].pixelAspectRatio());
        assert (header.screenWindowCenter() == headers[i].screenWindowCenter());
        assert (header.screenWindowWidth() == headers[i].screenWindowWidth());
        assert (header.lineOrder() == headers[i].lineOrder());
        assert (header.compression() == headers[i].compression());
        assert (header.channels() == headers[i].channels());
        assert (header.name() == headers[i].name());
        assert (header.type() == headers[i].type());
    }

    cout << "Reading whole files " << flush;

    //
    // Shuffle part numbers.
    //
    vector<int> shuffledPartNumber;
    int nHeaders = static_cast<int>(headers.size());
    for (int i = 0; i < nHeaders; i++)
        shuffledPartNumber.push_back(i);
    for (int i = 0; i < nHeaders; i++)
    {
        int a = random_int(nHeaders);
        int b = random_int(nHeaders);
        swap (shuffledPartNumber[a], shuffledPartNumber[b]);
    }

    //
    // Start reading whole files.
    //
    int i;
    int partNumber;
    try
    {
        for (i = 0; i < nHeaders; i++)
        {
            partNumber = shuffledPartNumber[i];
            switch (partTypes[partNumber])
            {
                case 0:
                {
                    FrameBuffer frameBuffer;
                    setInputFrameBuffer(frameBuffer, pixelTypes[partNumber],
                                        uData, fData, hData, width, height);

                    InputPart part(file, partNumber);
                    part.setFrameBuffer(frameBuffer);
                    part.readPixels(0, height - 1);
                    switch (pixelTypes[partNumber])
                    {
                        case 0:
                            assert(checkPixels<unsigned int>(uData, width, height));
                            break;
                        case 1:
                            assert(checkPixels<float>(fData, width, height));
                            break;
                        case 2:
                            assert(checkPixels<half>(hData, width, height));
                            break;
                    }
                    break;
                }
                case 1:
                {
                    TiledInputPart part(file, partNumber);
                    int numXLevels = part.numXLevels();
                    int numYLevels = part.numYLevels();
                    for (int xLevel = 0; xLevel < numXLevels; xLevel++)
                        for (int yLevel = 0; yLevel < numYLevels; yLevel++)
                        {
                            if (!part.isValidLevel(xLevel, yLevel))
                                continue;

                            int w = part.levelWidth(xLevel);
                            int h = part.levelHeight(yLevel);

                            FrameBuffer frameBuffer;
                            setInputFrameBuffer(frameBuffer, pixelTypes[partNumber],
                                                uData, fData, hData, w, h);

                            part.setFrameBuffer(frameBuffer);
                            int numXTiles = part.numXTiles(xLevel);
                            int numYTiles = part.numYTiles(yLevel);
                            part.readTiles(0, numXTiles - 1, 0, numYTiles - 1, xLevel, yLevel);
                            switch (pixelTypes[partNumber])
                            {
                                case 0:
                                    assert(checkPixels<unsigned int>(uData, w, h));
                                    break;
                                case 1:
                                    assert(checkPixels<float>(fData, w, h));
                                    break;
                                case 2:
                                    assert(checkPixels<half>(hData, w, h));
                                    break;
                            }
                        }
                    break;
                }
                case 2:
                {
                    DeepScanLineInputPart part(file, partNumber);

                    DeepFrameBuffer frameBuffer;

                    sampleCount.resizeErase(height, width);
                    frameBuffer.insertSampleCountSlice (Slice (IMF::UINT,
                                                        (char *) (&sampleCount[0][0]),
                                                        sizeof (unsigned int) * 1,
                                                        sizeof (unsigned int) * width));

                    setInputDeepFrameBuffer(frameBuffer, pixelTypes[partNumber],
                                            deepUData, deepFData, deepHData, width, height);

                    part.setFrameBuffer(frameBuffer);

                    part.readPixelSampleCounts(0, height - 1);

                    allocatePixels(pixelTypes[partNumber], sampleCount,
                                   deepUData, deepFData, deepHData, width, height);

                    part.readPixels(0, height - 1);
                    switch (pixelTypes[partNumber])
                    {
                        case 0:
                            assert(checkPixels<unsigned int>(sampleCount, deepUData, width, height));
                            break;
                        case 1:
                            assert(checkPixels<float>(sampleCount, deepFData, width, height));
                            break;
                        case 2:
                            assert(checkPixels<half>(sampleCount, deepHData, width, height));
                            break;
                    }

                    releasePixels(pixelTypes[partNumber],
                                  deepUData, deepFData, deepHData, width, height);

                    break;
                }
                case 3:
                {
                    DeepTiledInputPart part(file, partNumber);
                    int numXLevels = part.numXLevels();
                    int numYLevels = part.numYLevels();
                    for (int xLevel = 0; xLevel < numXLevels; xLevel++)
                        for (int yLevel = 0; yLevel < numYLevels; yLevel++)
                        {
                            if (!part.isValidLevel(xLevel, yLevel))
                                continue;

                            int w = part.levelWidth(xLevel);
                            int h = part.levelHeight(yLevel);

                            DeepFrameBuffer frameBuffer;

                            sampleCount.resizeErase(h, w);
                            frameBuffer.insertSampleCountSlice (Slice (IMF::UINT,
                                                                (char *) (&sampleCount[0][0]),
                                                                sizeof (unsigned int) * 1,
                                                                sizeof (unsigned int) * w));

                            setInputDeepFrameBuffer(frameBuffer, pixelTypes[partNumber],
                                                    deepUData, deepFData, deepHData, w, h);

                            part.setFrameBuffer(frameBuffer);

                            int numXTiles = part.numXTiles(xLevel);
                            int numYTiles = part.numYTiles(yLevel);

                            part.readPixelSampleCounts(0, numXTiles - 1, 0, numYTiles - 1,
                                                       xLevel, yLevel);

                            allocatePixels(pixelTypes[partNumber], sampleCount,
                                           deepUData, deepFData, deepHData, w, h);

                            part.readTiles(0, numXTiles - 1, 0, numYTiles - 1, xLevel, yLevel);
                            switch (pixelTypes[partNumber])
                            {
                                case 0:
                                    assert(checkPixels<unsigned int>(sampleCount, deepUData, w, h));
                                    break;
                                case 1:
                                    assert(checkPixels<float>(sampleCount, deepFData, w, h));
                                    break;
                                case 2:
                                    assert(checkPixels<half>(sampleCount, deepHData, w, h));
                                    break;
                            }

                            releasePixels(pixelTypes[partNumber],
                                          deepUData, deepFData, deepHData, w, h);
                        }

                    break;
                }
            }
        }
    }
    catch (...)
    {
        cout << "Error while reading part " << partNumber << endl << flush;
        throw;
    }
}


void
copyFile (const std::string & srcFn, const std::string & cpyFn)
{
    cout << "copying ";
    cout.flush();
    
    MultiPartInputFile in(srcFn.c_str());
    
    
    vector<Header> in_hdr(in.parts());
    for(int i=0;i<in.parts();i++)
    {
        in_hdr[i]=in.header(i);
    }
    
    MultiPartOutputFile out(cpyFn.c_str(),&in_hdr[0],in.parts());
    for(int i=0;i<in.parts();i++)
    {
        std::string part_type = in.header(i).type();
        if(part_type == DEEPSCANLINE)
        {
            DeepScanLineInputPart partin(in,i);
            DeepScanLineOutputPart partout(out,i);
            partout.copyPixels(partin);
        }
        else if(part_type == DEEPTILE)
        {
            DeepTiledInputPart partin(in,i);
            DeepTiledOutputPart partout(out,i);
            partout.copyPixels(partin);
        }else if(part_type== SCANLINEIMAGE)
        {
            InputPart partin(in,i);
            OutputPart partout(out,i);
            partout.copyPixels(partin);
        }
        else if(part_type==TILEDIMAGE)
        {
            TiledInputPart partin(in,i);
            TiledOutputPart partout(out,i);
            partout.copyPixels(partin);
        }
    }
    
}

void
testWriteCopyRead (int partNumber,
                   int runCount,
                   int randomReadCount,
                   const std::string & tempDir)
{
    cout << "Testing file with " << partNumber << " part(s)." << endl << flush;

    std::string srcFn = tempDir +  "imf_test_copy_multipart_source.exr";
    std::string cpyFn = tempDir +  "imf_test_copy_multipart_copy.exr";

    for (int i = 0; i < runCount; i++)
    {
        generateRandomFile (partNumber, srcFn);
        copyFile (srcFn, cpyFn);
        remove (srcFn.c_str());
        readWholeFiles (cpyFn);
        remove (cpyFn.c_str());

        cout << endl << flush;
    }
}

} // namespace

void testCopyMultiPartFile (const std::string & tempDir)
{
    try
    {
        cout << "Testing copying multi-part files" << endl;

        random_reseed(1);

        int numThreads = ThreadPool::globalThreadPool().numThreads();
        ThreadPool::globalThreadPool().setNumThreads(4);

        testWriteCopyRead ( 2, 20,  10, tempDir);
        testWriteCopyRead ( 1, 10,   5, tempDir);
        testWriteCopyRead ( 5,  4,  25, tempDir);
        testWriteCopyRead (50,  1, 250, tempDir);

        ThreadPool::globalThreadPool().setNumThreads(numThreads);

        cout << "ok\n" << endl;
    }
    catch (const std::exception &e)
    {
        cerr << "ERROR -- caught exception: " << e.what() << endl;
        assert (false);
    }
}
